Extinguishing capability of novel ultra-fine dry chemical agents loaded with iron hydroxide oxide

This study aimed to develop high-efficiency fire extinguishing agents that is halogen-free and phosphorus-free, natural clinoptilolite (CP) was used as a carrier to adsorb iron, and iron-loaded functional clinoptilolite (ICP) was prepared. The structure and morphology of the samples were characterized by Fourier transform infrared spectrometer , X-ray diffractometer, X-ray photoelectron spectroscopy, and scanning electron microscopy. The results showed that a layer of FeOOH is attached to the surface of the functionalized ICP, forming elliptical particles with a length of 100–500 nm, and the iron content can reach 4.99%. The suppression experiment involving pool fires indicated that the fire extinguishing performance of ICP is better than CP and commercial ABC dry powders fire extinguishing agents. The average extinguishing time and usage of ICP were reduced by 41.4% and 40.1%, respectively, compared with ABC powders. The improvement of the fire-extinguishing performance of ICP was mainly since the loaded iron ions are converted into active iron atoms during high-temperature combustion and participate in the catalytic reaction of capturing combustion radicals.